It might take up to six weeks to determine the exact cause of death for the Louisville woman who died in a boating accident on Lake Shelby over the weekend.Investigators are still trying to determine how 34-year-old Amanda Frank died and what caused the boat she was in to sink.As Frank's boat began taking on water Saturday evening, witnesses said her 12-year-old son tried to hold on to the boat and keep his mother alive.Despite his efforts, the Department of Fish and Wildlife said Frank was found lying face-down in the water."I can't even really comprehend that poor little boy out there with his mother and not being able to do anything. Then Mother's Day is the next day. That just kind of broke my heart," said witness Martha Turner.The Shelby County Coroner's Office will not rule Frank's death a drowning until they examine her medical records.Frank's estranged husband said she has a history of heart, liver and kidney problems.Turner, who has been at the lake for the past week, said she also heard that."The story that I heard at the very beginning is somebody had a heart attack or a stroke," said Turner.The Kentucky Department of Fish and Wildlife has already ruled out cracks in the hull, and despite some reports of a missing drain plug, Fish and Wildlife said that wasn't to blame for the boat filling up with water.They said it appears one of the contributing factors was that the boat was overloaded with equipment.Life vests were part of the cargo, but Frank, her son and her boyfriend weren't wearing them."I've never been able to comprehend why anyone, especially people who cannot swim, which I'm not the world's best swimmer, would refuse to put on a life jacket," said Turner.Fish and Wildlife said it is now looking into others leads as to why the boat sank Saturday evening. they would not comment on what those other potential causes are at this time.No charges will be filed.The law requires life jackets on board for each passenger. They must only be worn by children under 12 while the boat is moving.

SHELBY COUNTY, Ky. —

It might take up to six weeks to determine the exact cause of death for the Louisville woman who died in a boating accident on Lake Shelby over the weekend.

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Investigators are still trying to determine how 34-year-old Amanda Frank died and what caused the boat she was in to sink.

As Frank's boat began taking on water Saturday evening, witnesses said her 12-year-old son tried to hold on to the boat and keep his mother alive.

Despite his efforts, the Department of Fish and Wildlife said Frank was found lying face-down in the water.

"I can't even really comprehend that poor little boy out there with his mother and not being able to do anything. Then Mother's Day is the next day. That just kind of broke my heart," said witness Martha Turner.

The Shelby County Coroner's Office will not rule Frank's death a drowning until they examine her medical records.

Frank's estranged husband said she has a history of heart, liver and kidney problems.

Turner, who has been at the lake for the past week, said she also heard that.

"The story that I heard at the very beginning is somebody had a heart attack or a stroke," said Turner.

The Kentucky Department of Fish and Wildlife has already ruled out cracks in the hull, and despite some reports of a missing drain plug, Fish and Wildlife said that wasn't to blame for the boat filling up with water.

They said it appears one of the contributing factors was that the boat was overloaded with equipment.

Life vests were part of the cargo, but Frank, her son and her boyfriend weren't wearing them.

"I've never been able to comprehend why anyone, especially people who cannot swim, which I'm not the world's best swimmer, would refuse to put on a life jacket," said Turner.

Fish and Wildlife said it is now looking into others leads as to why the boat sank Saturday evening. they would not comment on what those other potential causes are at this time.

No charges will be filed.

The law requires life jackets on board for each passenger. They must only be worn by children under 12 while the boat is moving.